Grade 5 Agriculture Study Notes

Welcome to Conservation of Resources

In Grade 4, you learnt to make compost manure. In Grade 5, you will go further — improving soil, saving water, and protecting wild animals.

This strand has three parts:

• 1.1 Soil Conservation — find sites with poor soil, build an organic waste pit, and grow crops in it.
• 1.2 Water Conservation — keep soil moist using mulching, cover cropping and shading.
• 1.3 Conserving Wild Animals — keep wild animals away safely and live peacefully with wildlife.

Identifying Sites for Soil Improvement

Good soil grows healthy crops. Poor soil grows weak crops — or nothing at all. Your first job is to walk around your school or community and spot the areas where the soil needs help. Those are your sites for improvement.

Fertile soil vs infertile soil

Fertile soil has enough nutrients for crops to grow well. Infertile soil is missing those nutrients.

Good soil is important. Healthy crops feed families, reduce food costs, and keep communities well-nourished. Protecting good soil is worth the effort.

Signs of soil that needs improvement

When you walk around, look for these signs:

• Crops that are short, yellow or wilting even when watered
• Soil that is hard, cracked or bare
• Areas where rainwater runs off instead of soaking in
• Patches where soil has been washed away — the ground looks pale and thin

Soil erosion

Soil erosion is when rain or wind washes away the top layer of soil. That top layer — called topsoil — is the richest part. Once it is gone, what is left is poor and infertile.

Worked example: Atieno walks around her school. She finds one area where the ground is pale, hard and cracked. The crops there are short and yellow even though the garden is watered daily. She also notices that during rain, water runs across this area without soaking in. Atieno correctly identifies this as a site that needs soil improvement — the topsoil has been eroded and the soil is infertile.

Constructing an Organic Waste Pit for Soil Improvement

An organic waste pit is a hole dug into the ground where organic waste is dumped and left to decompose (rot and break down). As the waste rots, it releases nutrients into the soil. This makes the soil fertile and ready for growing crops.

It is a simple, low-cost way to recycle waste and improve your garden — and it protects the environment by turning rubbish into something useful.

What goes into the pit

Only organic materials — things that were once alive — can go in. They decompose and add nutrients.

Worked example: Kamau collects: dry banana leaves, a plastic bottle, vegetable peelings, and a rusty tin. He puts in the banana leaves and vegetable peelings — both are organic. He sets aside the plastic bottle and rusty tin — they do not decompose and would pollute the pit.

Materials You Will Need

Gather these tools and materials before you start. Most can be found in a typical school compound or at home. Each one has a specific job.

How to Do It

Follow these 8 steps in order:

Worked example: Grade 5 learners at Undugu Primary follow the steps. They choose a corner of the compound near the garden (Step 1), dig a wide pit using the jembe (Step 2), lay small stones at the base (Step 3), collect leaves, peelings and food remains and dump them in (Step 4), add a layer of soil on top (Step 5), sprinkle water (Step 6), plan to turn the materials every week (Step 7), and finally cover the pit with a polythene sheet (Step 8). They now wait for the waste to decompose.

If space is limited

No room for a pit? Use a drum as a compost bin. Organic waste goes inside, decomposes, and the compost improves your garden soil — same result, smaller space.

Safety

• Use the jembe and rake carefully — keep a safe distance from others when digging.
• Wash your hands with clean water and soap after the activity.
• The pit needs ongoing care — keep turning the waste, check the moisture, and keep the cover in place until everything has fully decomposed.

Demonstrating the Use of Plant Remains for Soil Improvement

Planting Crops in a Residue Pit

Once all the waste in the pit has fully decomposed, the pit becomes a residue pit — a rich, fertile growing space. The decomposed material is packed with nutrients. Crops planted here grow healthy and produce well.

Suitable crops for a residue pit include kales and tomatoes. These leafy vegetables do well in nutrient-rich soil.

What you will need

• Organic waste residue pit — fully decomposed
• Seedlings or seeds of your chosen crops
• Watering can and water
• Jembe
• Mulching materials — dry grass or leaves
• Protective gear — gloves, overalls and gumboots

Mulching materials are dry grass or leaves spread around the base of seedlings after planting. They keep moisture in the soil so seedlings do not dry out.

How to Do It

Follow these steps to plant crops in your residue pit:

Worked example: Gloria and her guardian dig a small pit at home. They dump plant residue, food remains and kitchen waste into it. Once it fully decomposes, they plant kales and tomatoes using the steps above. They water and weed the crops regularly. At harvest, the family eats fresh vegetables and saves money they would have spent at the market. The organic waste that would have been thrown away was recycled into rich soil — conserving the environment.

After planting — caring for your crops

Carry out these practices regularly until the crops mature:

Safety

• Wash your hands with clean water and soap after working in the residue pit.
• Wear protective gear — gloves, overalls and gumboots.

Key Points — Sub-strand 1.1 Soil Conservation

• Fertile soil grows healthy crops. Infertile soil produces short, yellow, weak crops.
• Signs of soil needing improvement: stunted yellow crops, hard or bare soil, soil erosion, water running off instead of soaking in.
• An organic waste pit is dug into the ground. Organic waste decomposes inside and makes the soil fertile.
• Only organic materials (plant residue, food remains, kitchen waste) go in. Keep out plastics, metal and glass.
• Construction order: choose site → dig → lay stones → add waste → alternate soil layers → sprinkle water → turn regularly → cover.
• A fully decomposed pit becomes a residue pit — ready for planting.
• Planting order: mix waste → add topsoil → dig holes → plant → cover roots → water → apply mulch.
• After planting: water, weed, thin, and control pests and diseases until harvest.
• No space for a pit? Use a drum as a compost bin.
• Using an organic waste pit recycles waste and conserves the environment.

Summary — the three activities of Sub-strand 1.1

Identifying Ways of Conserving Water for Household Gardening

In Grade 4, you learnt about drip irrigation as a way of saving water. In Grade 5, you will identify more ways of conserving water in kitchen and backyard gardening, practise them in school, and understand why they matter.

Soil water conservation means keeping water in the soil so that plants can use it. In gardening, soil water is conserved through three main practices: mulching, cover cropping, and shading.

Worked example: Aisha grows tomatoes in her backyard. During the dry season she notices the soil dries out quickly and her plants wilt. Her teacher suggests she try one of the three water conservation methods. Aisha spreads dry grass around her tomato plants (mulching). After a week, she feels the soil — it is still moist even without extra watering. She has successfully conserved water in her garden.

Mulching

Mulching involves spreading and covering the topsoil with a layer of materials such as dry grass, dry leaves, straws and crop remains. This covering reduces evaporation, keeping the soil moist for longer.

What you will need

• Established crops in the school compound
• Mulching materials — dry grass or leaves
• Gloves and gumboots

How to do it

1. Identify the crops that need mulching.
2. Water the crops first.
3. Spread the mulch and cover the soil around the base of the crops.

Safety

• When applying mulching materials, make sure they do not touch the stem of the crop.
• Wear gloves to avoid injuring your hands.

Worked example: Hassan's garden has maize plants. He waters them, then spreads dry grass around each plant's base, leaving a small gap at the stem. A week later the soil under the mulch is still moist while the uncovered patches nearby are dry. The mulch has slowed down water evaporation from the soil.